Mechanical vibration isolation liquid-helium-consumption-free extremely-low-temperature refrigerating system

Abstract

The invention belongs to the technical field of extremely-low-temperature refrigerating equipment, and particularly relates to a mechanical vibration isolation liquid-helium-consumption-free extremely-low-temperature refrigerating system. The system comprises a closed-cycle refrigerator system, a helium heat exchange air cooling vibration isolation system, an extremely-low-temperature throttle valve refrigerating system and a temperature feedback control system. According to the refrigerating manner provided by the system, the extremely-low temperature lowering to 1.4 K (based on helium-4 media) or 0.2 K (based on helium-3 media) can be achieved under the condition without consuming liquid helium, and meanwhile, the inherent mechanical vibration of the closed-cycle refrigerator system can be quite effectively isolated; and through the temperature feedback control system, variable temperature control can be achieved. The system is further suitable for an ultrahigh-vacuum environment needing to be subject to high-temperature baking.

Description

technical field [0001] The invention belongs to the technical field of ultra-low temperature refrigeration equipment, and in particular relates to a mechanical vibration isolation non-liquid helium consumption ultra-low temperature refrigeration device. Background technique [0002] The extremely low temperature environment refers to an environment lower than the gas-liquid phase transition temperature of helium 4 at normal pressure of 4.2K. It has important applications in the fields of physics, chemistry, materials, biology, national defense, and information. Many high-end precision scientific research and technical applications require not only an extremely low temperature environment but also a low-vibration environment and a vacuum, or even an ultra-high vacuum environment. At present, in the field of extremely low temperature equipment, there are refrigeration systems capable of obtaining extremely low temperature environments and low vibration environments, such as co...

AI Technical Summary

Problems solved by technology

However, the operation of this type of closed-cycle refrigerator system itself will introduce non-negligible low-frequency mechanical vibrations, which limits its application in fields that require low vibration and extremely low temperature environments at the same time.

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